Magneto-signal generator



(NoModeL) J. B. ODELL.

MAGNETO SIGNAL GENERATOR.

No. 251,128. Patented Dec. 20,1881.

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' MM? W+M UNITED STATES PATENT OFFICE.

JOHN B. ODELL, OF CHICAGO, ILLINOIS.

MAGNETO-SIGNAL GENERATOR.

SPECIFICATION forming part of Letters Patent No. 251,128, dated December 20, 1881.

Application filed July 29, 1881.

To all whom it may concern:

Be it known that I, JOHN B. ODELL, of Ohicago, Cook county, State of Illinois, have invented certain new and useful Improvements in Magn eto-Signal Generators for Telephones, of which the following is a specification.

My invention relates to improvements in automatic switches for establishing communication with the telephone call-bell or ringer when the crank of the generator is being turned, andof shunting or short-circuiting the ringer whe the said crank remains at rest.

Heretofore devices have been made which would operate to break the shunt-circuit and put the ringer in communication when the crank of the generator is turned in one direction,.but not when turned in the other. By the present invention the ringer is put in communication in whichever direction said crank may be turned, so that it is impossible for the person operating to make a mistake, however unskilled and little acquainted he maybe with the use of telephones.

In the accompanying drawings, which form a part of this specification, and in which similar letters of reference indicate like parts, Figure 1 is a side elevation of a device embodying my invention; Fig. 2, a plan view of the same; Fig. 3, a cross-section on lineman ot'Fig. 1; Fig. 4, a. longitudinal section on line y y of Fig. 2, and Fig. 5 a cross-section on line 2 z of Fig. 2.

In said drawings, A represents the drivingshaft of the generator, and A the main driving-gear.

B is the crank, havinga-hollow shell or socket fitting loosely over the end of the shaft A, and secured thereto by a set-screw, b, in such manner that the crank may turn on said shaft.

The wires 0 O, which form part of the short circuitby which the ringer is shunted or cut out when the crank ot' the generator is at rest, are connected by spring strips or contacts 0 c with two insulatedmetallic collars c 0 011 the generatorshaft. I e

The collars o and c are insulated from the shaft and from each other by the shell D, made of vnlcanite or otherinsulating material, surrounding said shaft. The collarsw and 0 which are preferably made of brass, are pro (No model.)

vided with guide-grooves c and c for the end of the strips 0 and 0, respectively.

dis a spring-bar, secured to a slotted projection, d, on the collar 0 by means of a screw, (1 The collar 0 is provided with a transverse slot. or'recess, a, having a central projection or contact-point, a, and the bar cl is provided with a corresponding projection or contactpoint, a on its under side, which presses against the contact-point a when the bar d is in its straight or normal position. The free end of the bar 01 projects between a couple of pins or lugs, a o on the crank B, so that in whichever direction the crank is turned the first result is to swing or move the bar cl to the one side or other until the projection a comes in contact with one end of the recess a, when the shaft of the generator then, of course, turns with the crank. Little blocks of vulcanite or other insulating material, a a areinserted in the ends of the recess a, so that the connection between the bar cl and collar 0 will be broken at this time.

Instead of inserting the insulating-blocks a (t in the recess a to form a stop or hearing for the bar (I, lugs or pins similar to the plus a and a may be provided on the insulating-shell D, in which case, of course, the relative position of these lugs should be such that the contact-point a cannot touch the end of the recess a; or, if preferred, a short transverse slot may be cut in the crank, through which projects a pin from the generator-shaft. When the operator lets go the crank the spring-bar d at once springs back into its normal position, thus forming a connection between thepoints a and a thereby completing the short circuit and cutting out the ringer, which circuit is broken at the points a and a the moment the operator begins to turn the crank in either direction, thereby putting the ringer in communication whenever the generator is being operated.

I have not thought it necessary to a fullunderstanding of the present invention to show or describe other parts of the magneto-electric generator or call-bell and telephone apparatus to which my invention is applied, as the construction thereof is well known.

I claim- 1. Thecombinatiomwiththegenerator-shaft, 2. The combination of generator-shaft A, of a crank adapted to turn thereon in either crank B, provided with pins a a, insulatingdirection within certain limits,aspring switchshell D, collars 0 bar (I, provided with conliar secured at one end to collar 0 mounted on tact-point a collar 0 provided with contact- 15 5 an insulating-shell surrounding said shaft, and point a, and stops a a substantially as speciarranged to make and break connection with fied. collar 0 also mounted on said insulating-shell,

and pins or projections a a secured to said JOHN ODELL' crank for operating the switch-bar when the Witnesses:

1o crank is turned in either direction, substan- T. EVERETT BROWN,

tially as specified. H. M. MUNDAY. 

